I think the healthcare (aka sickcare) business sh*t the bed by not pushing, and even discouraging, use of CT scans to produce CACS - coronary artery calcium score. Fast, simple, cheap, reliable way to find out if you have coronary artery disease, and how acute a case. The scan measures/detects calcified arterial plaques, and radiologist turns that into a numeric score. The more calcium in your arteries/walls, the higher the score. Zero score is what you want.
I mentioned it to a friend who'd been having some issues, he got the test, 1200s score, went right in for bypass - may have saved his life. His doc didn't recommend the CACS, I did. Treadmill stress tests, echos - meh. Cut out the guesswork and get a scan and CACS score. Pay cash if your doc won't write it up. Same radiation as a mammogram.